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Shangel335679 ∙
3n + 9 = 3(n + 3)
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'n' can be any number, but when applied to (2n + 4), n = 2.5
-3n+5n+4 = -4 2n = -4-4 2n = -8 n = -4
3n + 2n = 25 5n = 25 n = 5
n = 1